TRUTHTRANCE: semihypnotic trance induced by one of several "awareness spectrum" narcotics in which the petit betrayals of deliberate falsehood are apparent to the truthtrance observer.

(Note: "awareness spectrum" narcotics are frequently fatal except to desensitized individuals capable of transforming the poison-configuration within their own bodies.) TUPILE: so-called "sanctuary planet" (probably several planets) for defeated Houses of the Imperium.

(Water is poisonous to shai-hulud as the Fremen had long known from drowning the rare "stunted worm" of the Minor Erg to produce the awareness-spectrum narcotic they call Water of Life.

There are no more uses of "spectrum" in the book.

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That a man pleasured could so easily resolve himself to the whole spectrum of acts, indifferent and murderous and humane, and choose with such arbitrary will what he shall have to remember forever and forever.

Chang-rae Lee -- A Gesture Life

His appreciation of growing things became more subtle, turned within a more limited spectrum and gradually Lalla’s visits tapered away.